The biggest risk of a high -sodium diet is the effect_____ has on blood pressure and heart health?
题目
The biggest risk of a high -sodium diet is the effect_____ has on blood pressure and heart health?
A.it B.which C.what D.that
答案
it前省略了that.此句是以that引导的从句,it形式主语不可省略,所以只能选A.
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
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